Crystallization of zirconium nitride in silicon nitride ceramics with nitrogen pressures and sintering additives

被引:0
作者
Lee, SM [1 ]
Park, KH
Yoo, JW
Kim, HT
机构
[1] Korea Inst Ceram Engn & Technol, Seoul 153801, South Korea
[2] TaeguTec Ltd, Taegu 711860, South Korea
来源
ADVANCED SI-BASED CERAMICS AND COMPOSITES | 2005年 / 287卷
关键词
crystallization; silicon nitride; zirconium nitride; grain boundary phase;
D O I
10.4028/www.scientific.net/KEM.287.253
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We investigated grain boundary crystallization of gas-pressure-sintered silicon nitride with zirconia and magnesia as sintering aids. Cation compositions were mostly uniform throughout the specimen however, ZrO2 was crystallized in the surface region, while ZrN in the inside. When the specimen was heat-treated at 1 atm nitrogen atmosphere, ZrO2 in the surface region transformed to ZrN. The transformation, however, was suppressed when alumina was incorporated as an additional sintering aid. Based on these results, we propose a model describing the reaction among Si3N4, SiO2, ZrO2, ZrN and N-2. Observed microstructures and measured mechanical properties were consistent with the model.
引用
收藏
页码:253 / 258
页数:6
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